64 On Australian Entomostracans. 



hitherto known by its size. The shell is so transparent that 

 the eggs are readily seen through the hack. The thick setae of 

 the branchial plate on the first pair of foot jaws are plumose, 

 as in C carinata, and the second pair carry the small 

 branchial plate already referred to in the description of that 

 species. These peculiarities also distinguish it from C tri- 

 striata, described by Mr. Baird. It generally lives near the 

 bottom, on the mud. 



I have dedicated this species to my friend W. Scott, Esq, 

 of Ash Island, to whom I am under much obligation for his 

 kind encouragement of my researches into this interesting 



family. 



Locality ; — Denham Court, with C. carinata. 



6. C. Minna. PI. X. B. 



Shell nearly globular, sinuated on the ventral edge, 

 punctured, pilose ; the valves are very convex, and generally 

 of a transparent green colour. They are also found more 

 opaque, and of a dark brown, and in this variety the back 

 is more depressed ; a larger variety has its shell of a bright 

 chestnut colour. Setee of antennee and rami are very plumose. 

 I have been inclined to consider that the chestnut 

 variety is of a different species, but as yet have observed 

 no other difference than those of size and colour from the 

 ordinary form of the species named above. 



The brown variety is rather more depressed ; and thus it 

 is quite possible that there may be three species, when I 

 have named but one. I must leave this to be determined 

 by other observers. It is a very active species, and easily 

 kept under observation. I have had some in my Vivarium* 



* The Entomostraca are easily kept under observation in a basin con- 

 taining three or four gallons of water, with a little mud at the bottom, and 

 a few plants, Villarsia, Damasonium, Azolla, Lemna. The plants absorb 

 the carbonic acid generated by the respiration of the animals, and supply 

 oxygen for their inspiration, as well as provide them with food. A few 

 mollusks assist in consuming the vegetable matter as it decays. 



